An optically controlled whispering gallery mode generation system based on azobenzene material

Abstract

Provided is a light-operated echo wall mode generating system based on an azobenzene material. The system comprises a broadband light source, a 365nm ultraviolet source, an ultraviolet polarizing film, a conical fiber for generating an evanescent field, a clamping device and U-shaped frame of the conical fiber, a quartz microspherical cavity plated with an azobenzene thin film, a three-dimensional adjusting frame, a microobjective, a CCD, an optical fiber for connection, a display device and the like. The system achieves a light-operated echo wall system through sensitization processing on a micro-resonant cavity on the basis of a traditional micro-resonant cavity-conical fiber coupling system. In addition, due to the narrow linewidth property of the echo wall mode and the sensitivity of the azobenzene material to ultraviolet light, the device can be used for precision measurement of intensity of the ultraviolet light. The light-operated echo wall mode generating system can achieve the echo wall mode of different optical properties by adjusting the intensity and polarization state of the ultraviolet light and changing the size of the microspherical cavity and the thickness of the azobenzene thin film. The light-operated echo wall mode generating system has the advantages of being compact in structure, capable of achieving light-operated tuning of the optical property of the echo wall mode, high in ultraviolet light sensing sensitivity and the like.

Description

technical field [0001] The invention belongs to the field of micro-nano fiber optics. The invention combines the quartz micro-resonator-tapered quartz fiber coupling system and the photosensitive characteristics of azobenzene materials to form an optically controlled whispering gallery mode generation system, which can be used to control the intensity of ultraviolet light. Precision Sensing. Background technique [0002] Whispering gallery mode (WGM: WhisperingGalleryMode) is a special electromagnetic wave resonance mode that exists in a circularly symmetrical structure medium. WGM optical microcavity is a kind of optical microresonator with high quality factor and size comparable to the wavelength of resonant light wave. Various types of WGM microresonators such as pillars, disks, rings, wires, and spheres have excellent optical energy storage capabilities. Taking the microsphere cavity as an example, when the microsphere cavity is placed in an environment lower than its ...

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Problems solved by technology

[0007] When the azobenzene molecule changes from the trans structure to the cis isomer, the refractive index of the material will decrease, and when the linearly polarized light irradiates the azobenzene material, although it corresponds to the two directions perpendicular and parallel to the polarized light The refractive index of the azobenzene material will decrease, but the rate of decrease in the parallel direction is greater than that in the vertical direction, so polarized light irradiation will cause the azobenzene material to have optical birefringence properties, and as the irradiation time prolongs, the birefringence will increase and eventually reach saturation.

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